Maybe you've heard of this already, but I've just discovered it:
http://www.wishpot.com/?irc=logo

Wishpot is a website through which you can compose wish lists (and other types of lists of course) and keep track of all the stuff you see online that you want to buy immediately/are considering for a later date/would like to save as possible gift ideas etc.

You add the Wishpot button to your browser and everytime you see something on a website, you just click it. A window pops up and the info about the item is already there. You can then add tags etc. and can determine the privacy level (viewable only by you, viewable by friends and family, or viewable by everyone).
Bonus: you can also ask Wishpot to compare prices for any item on your lists!

I don't know about you ladies, but I have tons of items (not just clothing) to keep track of and this seems like a handy way to store them online instead of on my computer.